Improvement in apparatus for transmitting power and changing the speed



S. HIATT. DEFERENTIAL GEARING.

No. 111,539. Patented Feb. '7, 18H. 2W/g2 WWA/555:5, @LM/6% VENTO/a 1H: nanms PETERS "mann-1o.. wAsmNUroN, n. c.,

diritti sta SPENCER MATT, or cLAYToN, INDIANA.

Letters Patent No. 111,539, dated February 7, 1871:; antedated February 1, 18,71.

l IMPROVEMENT IN APPARATUS FOR TRANSMLTTINGPOWER AND CHANGING THE SPEED.

' referred tjo in the Letton Patent and making part of the lame.

I, SPENCER BLATT, of Clayton, in the county of Hendricks and State of Indiana, have invented a certain Differential Gearing, of which the followingis a specification.

Nat-ure mid Objects of the Invention.

The invention consists in a system of (bevel) cog and belt-gearing, arranged in such a manner that the difference in speed of two concentric wheels revolving in opposite directions is available to rotate at-hird wheel and arm keyed to the center shaft, which it propels.

`'.lhe object of t-bis combination is to obtain a slow revolution of the central shaftin either direction, the speedbeing adjustable; also, by means of a tighteningfpulley and brake, to start or stop the revolution of the shaft aforesaid, or to give it a quick reverse motion in one direction. I

The movement is applicable to various feeding (levices; also to obtain variable and reversible slow motion froml fast, for various purposes.

v Description ofthe Accompanying Dra-wing.

.Figure 1 is an elevation of the device embodying my invention, and

Figure 2 is a transverse vertical section taken on line a: x, fig. 1.

General Description. A is the framing B is the drivin g-shai't. VC is a shaft passing loosely through pulleys E and D' and gear-wheels `F and G y his an arm keyed to the shaft C, between wheels F and G.

On this arm, as an axis, is the cog-wheel H. This can revolve freely on arm l.

. The wheels F and G receive motion in the direction nf the arrows, respectively, by means of the belts K and L, from pulleys Eend 1).

D and D' are cone-pulleys in reverse order. The belt K is crossed. Corresponding points somewhere on the cones, as at c c', have the same proportion to each other as the pulleys E and E have, or c is to c', as E is to E'.

When the belt L is on the points c c', the wheels F and G have equal 'velocities in contrary directions, and the arm hmust remain stationary, because the pointsof contact of wheel H with the wheels F and G have au equal velocity. l A

As the belt-L is shifted to the large part of the cone D' and smallpart ofcone l),- the relative velocity of D' and G is less, and when shifted inthe contrary di. reotion it is greater. Thus, while wheel F has a con; st-ant velocity, the wheel G may have a varying velocity, both above and below that of F.

The arm h must rotate in the direction of the motion of the fastest. moving wheel, with a. speed equal. to half the difference of velocity ofgear-wheels F e is a tightening-pulley, shown in dotted lines in fig. 2. It is on the .arm or lever P. This is placcdon the shaft Cas a pivot or fulcrum, and confined by the collar 1..

N is a brake, and

O is a cam on the rock-shaft M.

The cam O acts on the arm P, or aprojection of it, olbiiig the tightening-pulley e up to and tighten the B. is a catch-bar, operated by the rock-shaft M, through the arm d, for holding thetighteniug-pully in position when belt K isin operation. It is held by a notch, as at m.

T is a slidingloop or belt-shifter, operated by the lever i, which is pivoted on a link, a.

a: is a coiled spring, to holdthe shifter T in place.

I is a counter-weight on the arniJr.

V is a cog (spur)wl1eel, to communicate the motion received from arm h and shaft C. Itis represented as meshing iut-o the segment Y on a portion of a carriage,

The operation is as follows: The tightening-pulley e is broughtv up against the belt, as shown in iig. 2,`by means of the lever Q. The belt may be held tight either by hand or by the catch- Abar It.

'ance on. the wheel V, and the shaft C-ceases to re- To revolve the shaft C -in the opposite direction to that of the arrow on wheel V, with considera-ble velocity, let the lever Q, be pulled back so asv to bring the brake N up to the peripery ofthe wheel F with a force sutlicient to retard or stop its motion.' This will cause the arm h to rotate in the same direction as the wheel G, so that the carriage W may thus be reversed with a quick continuous or a slower intermittent motion, and may bestopped at any point desired by releasing the'brake.

Claims.

I claim as my inventiouv 1. The bevel-wheels F, G, and H, arm h, and shaft C, cone-pulleys D and D', pulleys E and E', and belts' K and L, arranged and operated snbstantiallyas and for the purpose hereinbeforc vset forth 2. The lever Q, rock-shaft M, cam (J, lbrake N, and catch-bar`t, arranged and operated as and for the purpose hereiubefore sct forth.'

' SPENCER HIATT.

Witnesses:

O. F. MArnuw, J. M. Sonnen.

a is a lever or handle for operating the rockshaft 

